A continuous and long-term in-situ stress measuring method based on fiber optic. Part I: Theory of inverse differential strain analysis  

作　　者：Kun-Peng Zhang Mian Chen Chang-Jun Zhao Su Wang Yong-Dong Fan 

机构地区：[1]State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum,Beijing,102249,China [2]MOE Key Laboratory of Petroleum Engineering in China University of Petroleum,Beijing,102249,China [3]Beijing International Center for Gas Hydrate,School of Earth and Space Sciences,Peking University,Beijing,100871,China

出　　处：《Petroleum Science》2024年第2期1171-1189,共19页石油科学（英文版）

基　　金：the Project Support of NSFC(No.U19B6003-05 and No.52074314)。

摘　　要：A method for in-situ stress measurement via fiber optics was proposed. The method utilizes the relationship between rock mass elastic parameters and in-situ stress. The approach offers the advantage of long-term stress measurements with high spatial resolution and frequency, significantly enhancing the ability to measure in-situ stress. The sensing casing, spirally wrapped with fiber optic, is cemented into the formation to establish a formation sensing nerve. Injecting fluid into the casing generates strain disturbance, establishing the relationship between rock mass properties and treatment pressure.Moreover, an optimization algorithm is established to invert the elastic parameters of formation via fiber optic strains. In the first part of this paper series, we established the theoretical basis for the inverse differential strain analysis method for in-situ stress measurement, which was subsequently verified using an analytical model. This paper is the fundamental basis for the inverse differential strain analysis method.

关 键 词：In-situ stress Fiber optic Orthotropic elastic Differential evolution ABAQUS 

分 类 号：TE311[石油与天然气工程—油气田开发工程]